By that I mean if you can have Kreia the former Jedi Master-Sith Lord-Gray Jedi as a low level character.

The reason she was low level was that Kreia was stripped of the Force by the Sith...Just like you were stripped of the Force (but, of course, you were the one that stripped it from yourself). I don't think Bastilla should be stripped of the force...that would be too repetetive.